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Categories To Find "Psi" Experts:
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DEEP SEA DIVER |
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Diving is still evolving, but general classifications have grown up to describe various diving activities. These classifications include but are not limited to:
Commercial diving
Military diving
Combat divers
Armed forces work divers
Recreational diving
Underwater Photography & Video
Spear fishing
Marine life counting and identification
Rescue & recovery diving
Scientific diving
Technical diving (also called Tech Divers)
Cave diving
Cavern diving
Deep diving
Ice diving
Wreck diving
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GEOTECHNICAL ENGINEERING |
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Geotechnical engineering is concerned with the engineering properties of earth materials. Geotechnical engineers investigate the soil and bedrock below a site to confirm their engineering properties as they will relate to the proposed costruction.
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POLLUTION |
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Pollution is the release of environmental contaminants. Carbon monoxide, sulfur dioxide, chlorofluorocarbons (CFCs), and nitrogen oxides produced by industry and motor vehicles are common air pollutants. Sunlight converts nitrogen oxides and hydrocarbons to ozone or smog. Water pollutants may consist of a wide range of organic and inorganic chemicals such as heavy metals, petrochemicals, chloroform, and bacteria. Water pollution may also occur in the form of thermal pollution and dissolved oxygen depletion. Soil contamination is an important aspect of environmental pollution; this phenomenon occurs when chemicals are released by spill or underground storage tank leakage. Among the most significant soil contaminants are hydrocarbons, heavy metals, MTBE, herbicides, pesticides and chlorinated hydrocarbons. The U.S., Russia, China and Japan are the world leaders in air pollution emissions; however, Canada is the number two country on a per capita basis.
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POWER PLANTS |
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A fossil fuel power plant is an energy conversion center that combusts fossil fuels to produce electricity, designed on a large scale for continuous operation.
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PROFESSIONAL SCUBA DIVER |
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Diving is still evolving, but general classifications have grown up to describe various diving activities. These classifications include but are not limited to:
Commercial diving
Military diving
Combat divers
Armed forces work divers
Recreational diving
Underwater Photography & Video
Spear fishing
Marine life counting and identification
Rescue & recovery diving
Scientific diving
Technical diving (also called Tech Divers)
Cave diving
Cavern diving
Deep diving
Ice diving
Wreck diving
Scuba diving is swimming underwater while using self-contained breathing equipment.
Scuba divers exploring fish and coral.By carrying a source of compressed air, the scuba diver is able to stay underwater longer than with the simple breath-holding techniques used in Snorkeling and Free-diving, and is not hindered by air-lines to a remote air source. The scuba diver typically swims underwater by using fins attached to the feet. However, some divers also move around with the assistance of a DPV (Diver Propulsion Vehicle), commonly referred to as a "scooter", or by using surface-tethered devices called sleds, which are pulled by a boat.
The term SCUBA arose during World War II and originally referred to USA combat frogmen's oxygen rebreathers, developed by Dr. Christian Lambertsen for underwater warfare. Today, SCUBA typically usually refers to the in-line open-circuit equipment, developed by Emile Gagnan and Jacques-Yves Cousteau, in which compressed gas (usually air) is inhaled from a tank and then exhaled into the water. However, rebreathers (both semi-closed circuit and closed circuit) are also self-contained systems (as opposed to surface-supplied systems) and are therefore classified as SCUBA.
Although the word 'SCUBA' is an acronym for "Self Contained Underwater Breathing Apparatus", it has also become acceptable to refer to SCUBA as 'scuba equipment' or 'scuba apparatus'.
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